In this handout government image provided by ABC news, the package of the PETN explosive powder from a singed pair of underwear with a packet of powder sewn into the crotch, is all that remains of a failed attempt to down a Northwest Airlines flight over Detroit. The alleged bomb consisted of a packet of powder sewn into the briefs of Umar Farouk Abdulmutallab, a 23-year-old Nigerian. Al Qaeda took credit for the attempted bombing, boasted of its ability to overcome U.S. intelligence and airport security, and promised new attacks. Photo includes a ruler to provide scale. (Photo by ABC News via Getty Images)

In this handout government image provided by ABC news, the package of the PETN explosive powder from a singed pair of underwear with a packet of powder sewn into the crotch, is all that remains of a failed attempt to down a Northwest Airlines flight over Detroit. The alleged bomb consisted of a packet of powder sewn into the briefs of Umar Farouk Abdulmutallab, a 23-year-old Nigerian. Al Qaeda took credit for the attempted bombing, boasted of its ability to overcome U.S. intelligence and airport security, and promised new attacks. Photo includes a ruler to provide scale. (Photo by ABC News via Getty Images)

In this handout government image provided by ABC news, the package of the PETN explosive powder from a singed pair of underwear with a packet of powder sewn into the crotch, is all that remains of a failed attempt to down a Northwest Airlines flight over Detroit. The alleged bomb consisted of a packet of powder sewn into the briefs of Umar Farouk Abdulmutallab, a 23-year-old Nigerian. Al Qaeda took credit for the attempted bombing, boasted of its ability to overcome U.S. intelligence and airport security, and promised new attacks. Photo includes a ruler to provide scale. (Photo by ABC News via Getty Images)